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CFD simulation and PIV test technology provide effective solution for revealing the complex flow of hydrodynamic coupling’s internal flow field.
In order to reflect the gas-fluid two-phase flow of coupling objectively, CFD three-dimensional numerical simulation is conducted under two typical operation conditions.
Currently, the research on the flow field of hydrodynamic coupling mainly included two methods: experimental study based on modern flow test and CFD simulation.
According to the foreign journals, research on internal flow field of the hydraulic elements focused on CFD simulation.
(a)3D model (b) CFD simulation (c) Grid model Figure 1.

The simulation and analysis were carried out using finite volume CFD solver ANSYS CFX.
The turbulent model used in this simulation is the standard k-ε model.
Results and Discussion CFD Model and Validation.
For all CFD models used in the simulation, a size of cells used in the circle grid fractal plate region is 1 mm3.
The CFD model was validated through comparison with the calculated pressure drop correlation.

Therefore numerical simulation using the computational fluid dynamic (CFD) approach is proposed in this research.
Hartinger et al. [4] presented the CFD modeling of the thermo EHL line contact problem.
CFD Model The CFD approach uses the Navier-Stokes equations, as given below, to calculate the velocity and pressure of fluid flow in the EHL problem instead of using the simplified Reynolds equation
In this research, the ICEMCFD software is chosen to create the CFD geometry and meshes, as shown in Fig. 1.
The leading parameters used in the simulation are given in Fig. 1 and Table 1.

CFD Numerical Simulation of Internal Flow for Electronic Gasoline Injector Xiaoyan Lia, Zhendong Zhangb ,Hao Qianc , Qiang Chengd Institute of Automotive Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China aLixiaoyan2009niu@163.com, busstzzd@126.com, cqh198509@126.com, d417151665@qq.com Keywords: electronic gasoline injector；CFD ；numerical simulation ；internal flow Abstract.
The aim of this paper is to define a CFD methodology for the simulation of gasoline injector.
For instance, a CFD methodology of a PFI engine has been used to evaluate the injector geometry and injection timing influences on the mixture preparation and a new CFD approach for assessment of swirl flow pattern in HSDI diesel engines [1,7].
In particular, CFD simulation is focused on the investigation of the influence of different structures of valve seat with various angles of nozzle inclination on pressure distribution and the changes of average velocity in the nozzle.
A new approach to analysis the internal flow of electronic gasoline injector by means of CFD numerical simulation is developed and presented.

A CFD Simulation of Strouhal Number for U-shaped Section Aqueducts Yuchun Li 1, a, Xiaojie Zhang1, b, Shiwen Jia 1, c 1 College of Civil Engineering, Tongji University, Shanghai, 200092, China a YCL2000@tongji.edu.cn, b10zxj@tongji.edu.cn, c sdshiwen@163.com Keywords: Aqueduct, U-shaped section, Strouhal number, Computational Fluid Dynamics (CFD) .
Principle of Simulation The aqueduct body can be considered as a bluff body immersed in the air.
With the development of CFD technique, the Strouhal number can also be obtained by numerical simulation.
The cases of simulation are listed in Table 1.
Wilcox: Turbulence Modeling for CFD (DCW Industries, California 2006)

Three Phase CFD-Simulation of CAS-OB Ladle Timo Kulju1,a, Seppo Ollila2,b, Riitta L.
Initial mesh for this ladle is done with the Gambit-2.4.6 program and the simulations are performed with the OpenFOAM-2.1.1 CFD-package.
CFD-Model.
The CFD-model used in this simulation is a modified Eulerian multiphase model [7], which includes volume of fluid (VOF) interface capture [8,9].
The next steps in this study would be to run simulations with different inlet values and include the bell into the simulations.

Geometric modelling and meshing have been carried out using ANSYS ICEM CFD.
Computer simulations have been carried using the commercial CFD package, ANSYS FLUENT.
The CFD software, FLUENT, has been widely used for simulation of fluid flow problems.
Thus these works can be accomplished through numerical simulations [4].
Hence this work focuses on exploring the efficacies of CFD based numerical simulations in a stir casting process and consequently the effect of different parameters such as the ratio of stirrer to crucible dimensions, rotating speed etc. on the mushy state mixing and in turn on the solidification pattern Simulations The stir casting process, which is one of the most employed methods for the production of the MMC, has been studied.

CFD.
The result provides model data and parameters for CFD simulation, which has directive significance to concern the high intensity downburst wind load in structure design.
Some scholars have studied characteristics of high-precision downburst wind field with CFD numerical simulation method[4].
By simulating, the height of maximum sinking speed is determined, at which velocity field is selected to be initial injection velocity of CFD simulation.
The pressure and temperature field in corresponding region can be introduced to provide reliable evidence for high-precision CFD simulation.

CFD Simulation of Gas Residence Time Distribution in Agitated Tank LI Liangchao Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China.
Computational Fluid Dynamics(CFD) is a kind of numerical simulation technology which studies fluid.
The gas-liquid flow in agitated tank can also be studied by CFD simulation.
CFD-DPM method.
Figure 4 shows the comparison of the gas-RTD simulation results with Euler-Tracer method and CFD-DPM method.

The large eddy simulation (LES) of turbulence model was written using C++ language.
Experiments of Yi Zeng et al. [13] were chosen to compare flame lengths with simulations of a developed CFD code in this research cause of a simple shape of a burner and clearly explanation of an experimental method.
CFD domain Figure 1.
Boundary conditions of the CFD domain.
The comparison between CFD simulation and experiment implied an accuracy of the developed C++ codes.